tom sherwood with a look at the plan that includes the white house visitor center. tom? >> wendy, tourism in the nation's capital is big business. but ugly security barriers don't help. little known national aquarium has been tucked away since 1932 in the huge basement of the commerce department building downtown. video screens, live exhibits delight visitors like this capital from boston. what do you think? >> it's great. >> ugly sidewalk secure barriers in place since 9/11, they were supposed to be temporary, still discourage foot traffic to the aconveyor numb and the white house visitors center. >> where now there have been planters sitting for a long time, the trees aren't terribly healthy. the sidewalk isn't in good shape. >> but the entire perimeter, one side isour football fields long, about got pedestrian friendly security that respects the historic building. >> really one of the first times for the federal government to come up with a design solution that actually enhances the public sidewalk. >> the national planning commission, the regional agency that approve